What does "Cookies" mean?

Cookies:

Cookies are small files (created by the websites you visit) that are placed on your computer or other device. Among other things, cookies can save (on your own computer) information about your visit and your preferences, keep you logged in to a website, and record info about ads on the pages you visit. (And much more). Cookies are being phased out in favor of other arguably less creepy methods (such as FLoC) of tracking your online movements and preferences.

 Google: Cookie Management